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1.合肥工业大学电气与自动化工程学院,安徽省合肥市 230009
2.光伏系统教育部工程研究中心(合肥工业大学),安徽省合肥市 230009
周冠卿(1998—),男,硕士研究生,主要研究方向:逆变器的控制与调制技术。E-mail:1005289111@qq.com
张国荣(1963—),男,通信作者,博士,教授,主要研究方向:电能质量控制技术、储能系统中的电力变换技术和光伏发电技术。E-mail:zhanggrcao@163.com
解润生(1990—),男,博士研究生,主要研究方向:逆变器的控制与调制技术。E-mail:runsheng_xie314@hotmail.com
收稿:2021-12-31,
修回:2022-08-08,
网络出版:2022-11-14,
纸质出版:2023-01-10
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周冠卿,张国荣,解润生等.改进的三电平逆变器变虚拟空间矢量调制策略[J].电力系统自动化,2023,47(1):172-182.
ZHOU Guanqing,ZHANG Guorong,XIE Runsheng,et al.Improved Variable Virtual-space-vector Modulation Strategy for Three-level Inverter[J].Automation of Electric Power Systems,2023,47(1):172-182.
周冠卿,张国荣,解润生等.改进的三电平逆变器变虚拟空间矢量调制策略[J].电力系统自动化,2023,47(1):172-182. DOI: 10.7500/AEPS20211231009.
ZHOU Guanqing,ZHANG Guorong,XIE Runsheng,et al.Improved Variable Virtual-space-vector Modulation Strategy for Three-level Inverter[J].Automation of Electric Power Systems,2023,47(1):172-182. DOI: 10.7500/AEPS20211231009.
中点电位平衡问题始终是中点钳位型(NPC)三电平逆变器研究的热点问题。文中首先介绍了NPC逆变器的拓扑结构,并分析了传统虚拟空间矢量调制的工作原理及不足之处。在此基础上,为提高中点电位平衡效果,提出一种改进的变虚拟空间矢量调制方法。该方法首先通过引入变虚拟中矢量平衡因子来重新定义虚拟中矢量,然后分析其在单位开关周期内所能产生的电荷量并据此确立矢量顺序,从而在保持中点电位稳态精度的基础上,提高其动态平衡速度。此外,在确立矢量顺序的过程中,分析了系统的输出状态并引入相占空比法进行优化,以减小系统在动态平衡过程中的输出状态切换次数。仿真和实验结果验证了所提调制算法的有效性。
The neutral point potential balance is always a hot topic in the research of the neutral point clamped (NPC) three-level inverter. The topology of the NPC inverter is introduced and the working principle and shortcomings of the traditional virtual space vector modulation strategy are analyzed in this paper. On this basis
to improve the balance effect of neutral point potential
an improved variable virtual-space-vector modulation algorithm is proposed. The virtual medium vector is redefined by introducing the variable virtual medium vector balance factor. Then the amount of charge generated by the virtual medium vector in a unit switching cycle is analyzed and the vector order is established accordingly
to improve its dynamic balance speed on the basis of maintaining the steady-state accuracy of the neutral point potential. In addition
in the process of establishing the vector sequence
the output state of the system is analyzed and the phase duty cycle method is adopted for optimization
to reduce the output state switching times of the system in the process of dynamic balance. Finally
the effectiveness of the proposed modulation method is verified by simulation and experiments.
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